<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.jpg" alt />
      </div>
      <!-- 登录表单区域 -->
      <el-form
        :model="loginForm"
        ref="loginFormRef"
        :rules="loginFormRules"
        label-width="0px"
        class="login_form"
        @keyup.enter.native="login"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.account_number" prefix-icon="el-icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginForm.account_password" prefix-icon="el-icon-lock" type="password"></el-input>
        </el-form-item>
        <!--  按钮区域-->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //这是登录表单的数据绑定对象
      loginForm: {
        account_number: "184804325",
        account_password: "123456"
      },
      //这是表单的验证规则对象
      loginFormRules: {
        //验证用户名是否合法
        account_number: [
          { required: true, message: "请输入用户名", trigger: "blur" },
          {
            min: 3,
            max: 10,
            message: "长度在 3 到 10 个字符",
            trigger: "blur"
          }
        ],
        //验证密码是否合法
        account_password: [
          { required: true, message: "请输入密码", trigger: "blur" },
          {
            min: 6,
            max: 15,
            message: "长度在 6 到 15 个字符",
            trigger: "blur"
          }
        ]
      }
    };
  },
  methods: {
    resetLoginForm: function() {
      // console.log(this);
      this.$refs["loginFormRef"].resetFields();
    },
    login: function() {
      this.$refs["loginFormRef"].validate(async valid => {
        if (!valid) {
          return;
        }
        const { data: res } = await this.$http.post("/login", this.loginForm);
        if (res.meta.success !== true) {
          return this.$message.error("登录失败！");
        }
        this.$message.success("登陆成功！");
        //1.将登陆成功之后的token，保存到客户端的sessionStorage中
        //1.1 项目中除了登录之外的其他API接口，必须在登录之后才能访问
        //1.2 token 值应该在当前网站打开期间生效，所以讲token保存在sessionStorage中
        window.sessionStorage.setItem("token", res.data.token);
        window.sessionStorage.setItem("userInfo", JSON.stringify(res.data));
        //2. 通过编程式导航跳转到后台主页，路由地址是 /home
        this.$router.push("/home");
      });
    }
  }
};
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b8b;
  height: 100%;
}

.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);

  .avatar_box {
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}

.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}

.btns {
  display: flex;
  justify-content: flex-end;
}
</style>
